Bulk viscosity has recently been shown to play an important role in describing both photon  and hadron  observables at the Relativistic Heavy-Ion Cllider (RHIC) and the Large Hadron Collider (LHC). The presence of a temperature-dependent bulk viscosity in the hydrodynamical evolution of the medium modifies the development of the hydronynamic momentum anisotropy differently in the high- and low-temperature regions. Thus, anisotropic flow coefficients of hadronic observables, which are emitted predominantly from low temperatures, are affected differently by bulk viscosity than electromagnetic probes which are radiated during the entire evolution. Starting from the IP-Glasma initial conditions [1,2], we study how thermal dilepton production gets modified owing to the presence of bulk viscosity at RHIC and LHC energies. With calculations at different collision energies we can draw more robust conclusions regarding the role of bulk viscosity in high energy heavy-ion collisions. Dilepton radiation from the dilute phase of the medium will be included for the first time using the Boltzmann-transport model SMASH  and compared to previous hydrodynamic approaches to ascertain whether these modifications may be observable in experimental data.
 Jean-François Paquet et al., Phys. Rev. C 93 no. 4, 044906 (2016)
 S. Ryu et al., Phys. Rev. Lett. 115 no. 13, 132301 (2015)
 Janus Weil et al., arXiv:1604.07028 and arXiv:1606.06642
|Preferred Track||Electromagnetic Probes|